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telemetry.c
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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2014, 2015 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
//#define DEBUG1 1 /* Parsing of original human readable format. */
//#define DEBUG2 1 /* Parsing of base 91 compressed format. */
//#define DEBUG3 1 /* Parsing of special messages. */
//#define DEBUG4 1 /* Resulting display form. */
#if TEST
#define DEBUG1 1 // Activate debug out when testing.
#define DEBUG2 1 //
#define DEBUG3 1 //
#define DEBUG4 1 //
#endif
/*------------------------------------------------------------------
*
* Module: telemetry.c
*
* Purpose: Decode telemetry information.
* Point out where it violates the protocol spec and
* other applications might not interpret it properly.
*
* References: APRS Protocol, chapter 13.
* http://www.aprs.org/doc/APRS101.PDF
*
* Base 91 compressed format
* http://he.fi/doc/aprs-base91-comment-telemetry.txt
*
*---------------------------------------------------------------*/
#include "direwolf.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
#include "ax25_pad.h" // for packet_t, AX25_MAX_ADDR_LEN
#include "decode_aprs.h" // for decode_aprs_t, G_UNKNOWN
#include "textcolor.h"
#include "telemetry.h"
#define MAX(x,y) ((x)>(y) ? (x) : (y))
#define T_NUM_ANALOG 5 /* Number of analog channels. */
#define T_NUM_DIGITAL 8 /* Number of digital channnels. */
#define T_STR_LEN 16 /* Max len for labels and units. */
#define MAGIC1 0x5a1111a5 /* For checking storage allocation problems. */
#define MAGIC2 0x5a2222a5
#define C_A 0 /* Scaling coefficient positions. */
#define C_B 1
#define C_C 2
/*
* Metadata for telemetry data.
*/
struct t_metadata_s {
int magic1;
struct t_metadata_s * pnext; /* Next in linked list. */
char station[AX25_MAX_ADDR_LEN]; /* Station name with optional SSID. */
char project[40]; /* Description for data. */
/* "Project Name" or "project title" in the spec. */
char name[T_NUM_ANALOG+T_NUM_DIGITAL][T_STR_LEN];
/* Names for channels. e.g. Battery, Temperature */
char unit[T_NUM_ANALOG+T_NUM_DIGITAL][T_STR_LEN];
/* Units for channels. e.g. Volts, Deg.C */
float coeff[T_NUM_ANALOG][3]; /* a, b, c coefficients for scaling. */
int coeff_ndp[T_NUM_ANALOG][3]; /* Number of decimal places for above. */
int sense[T_NUM_DIGITAL]; /* Polarity for digital channels. */
int magic2;
};
static struct t_metadata_s * md_list_head = NULL;
static void t_data_process (struct t_metadata_s *pm, int seq, float araw[T_NUM_ANALOG], int ndp[T_NUM_ANALOG], int draw[T_NUM_DIGITAL], char *output, size_t outputsize);
/*-------------------------------------------------------------------
*
* Name: t_get_metadata
*
* Purpose: Obtain pointer to metadata for specified station.
* If not found, allocate a fresh one and initialize with defaults.
*
* Inputs: station - Station name with optional SSID.
*
* Returns: Pointer to metadata.
*
*--------------------------------------------------------------------*/
static struct t_metadata_s * t_get_metadata (char *station)
{
struct t_metadata_s *p;
int n;
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("t_get_metadata (station=%s)\n", station);
#endif
for (p = md_list_head; p != NULL; p = p->pnext) {
if (strcmp(station, p->station) == 0) {
assert (p->magic1 == MAGIC1);
assert (p->magic2 == MAGIC2);
return (p);
}
}
p = malloc (sizeof (struct t_metadata_s));
memset (p, 0, sizeof (struct t_metadata_s));
p->magic1 = MAGIC1;
strlcpy (p->station, station, sizeof(p->station));
for (n = 0; n < T_NUM_ANALOG; n++) {
snprintf (p->name[n], sizeof(p->name[n]), "A%d", n+1);
}
for (n = 0; n < T_NUM_DIGITAL; n++) {
snprintf (p->name[T_NUM_ANALOG+n], sizeof(p->name[T_NUM_ANALOG+n]), "D%d", n+1);
}
for (n = 0; n < T_NUM_ANALOG; n++) {
p->coeff[n][C_A] = 0.;
p->coeff[n][C_B] = 1.;
p->coeff[n][C_C] = 0.;
p->coeff_ndp[n][C_A] = 0;
p->coeff_ndp[n][C_B] = 0;
p->coeff_ndp[n][C_C] = 0;
}
for (n = 0; n < T_NUM_DIGITAL; n++) {
p->sense[n] = 1;
}
p->magic2 = MAGIC2;
p->pnext = md_list_head;
md_list_head = p;
assert (p->magic1 == MAGIC1);
assert (p->magic2 == MAGIC2);
return (p);
} /* end t_get_metadata */
/*-------------------------------------------------------------------
*
* Name: t_ndp
*
* Purpose: Count number of digits after any decimal point.
*
* Inputs: str - Number in text format.
*
* Returns: Number digits after decimal point. Examples, in --> out.
*
* 1 --> 0
* 1. --> 0
* 1.2 --> 1
* 1.23 --> 2
* etc.
*
*--------------------------------------------------------------------*/
static int t_ndp (char *str)
{
char *p;
p = strchr(str,'.');
if (p == NULL) {
return (0);
}
else {
return (strlen(p+1));
}
}
/*-------------------------------------------------------------------
*
* Name: telemetry_data_original
*
* Purpose: Interpret telemetry data in the original format.
*
* Inputs: station - Name of station reporting telemetry.
* info - Pointer to packet Information field.
* quiet - suppress error messages.
*
* Outputs: output - Decoded telemetry in human readable format.
* TODO: How big does it need to be? (buffer overflow?)
* comment - Any comment after the data.
*
* Description: The first character, after the "T" data type indicator, must be "#"
* followed by a sequence number. Up to 5 analog and 8 digital channel
* values are specified as in this example from the protocol spec.
*
* T#005,199,000,255,073,123,01101001
*
* The analog values are supposed to be 3 digit integers in the
* range of 000 to 255 in fixed columns. After reading the discussion
* groups it seems that few adhere to those restrictions. When I
* started to look for some local signals, this was the first one
* to appear:
*
* KB1GKN-10>APRX27,UNCAN,WIDE1*:T#491,4.9,0.3,25.0,0.0,1.0,00000000
*
* Not integers. Not fixed width fields.
*
* Originally I printed a warning if values were not in range of 000 to 255
* but later took it out because no one pays attention to that original
* restriction anymore.
*
*--------------------------------------------------------------------*/
void telemetry_data_original (char *station, char *info, int quiet, char *output, size_t outputsize, char *comment, size_t commentsize)
{
int n;
int seq;
char stemp[256];
char *next;
char *p;
float araw[T_NUM_ANALOG];
int ndp[T_NUM_ANALOG];
int draw[T_NUM_DIGITAL];
struct t_metadata_s *pm;
#if DEBUG1
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n%s\n\n", info);
#endif
strlcpy (output, "", outputsize);
strlcpy (comment, "", commentsize);
pm = t_get_metadata(station);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
seq = 0;
for (n = 0; n < T_NUM_ANALOG; n++) {
araw[n] = G_UNKNOWN;
ndp[n] = 0;
}
for (n = 0; n < T_NUM_DIGITAL; n++) {
draw[n] = G_UNKNOWN;
}
if (strncmp(info, "T#", 2) != 0) {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Error: Information part of telemetry packet must begin with \"T#\"\n");
}
return;
}
/*
* Make a copy of the input string (excluding T#) because this will alter it.
* Remove any trailing CR/LF.
*/
strlcpy (stemp, info+2, sizeof(stemp));
for (p = stemp + strlen(stemp) - 1; p >= stemp && (*p == '\r' || *p == '\n') ; p--) {
*p = '\0';
}
next = stemp;
p = strsep(&next,",");
if (p == NULL) {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Nothing after \"T#\" for telemetry data.\n");
}
return;
}
seq = atoi(p);
n = 0;
while ((p = strsep(&next,",")) != NULL) {
if (n < T_NUM_ANALOG) {
if (strlen(p) > 0) {
araw[n] = atof(p);
ndp[n] = t_ndp(p);
}
// Version 1.3: Suppress this message.
// No one pays attention to the original 000 to 255 range.
// BTW, this doesn't trap values like 0.0 or 1.0
//if (strlen(p) != 3 || araw[n] < 0 || araw[n] > 255 || araw[n] != (int)(araw[n])) {
// if ( ! quiet) {
// text_color_set(DW_COLOR_ERROR);
// dw_printf("Telemetry analog values should be 3 digit integer values in range of 000 to 255.\n");
// dw_printf("Some applications might not interpret \"%s\" properly.\n", p);
// }
//}
n++;
}
if (n == T_NUM_ANALOG && next != NULL) {
/* We expect to have 8 digits of 0 and 1. */
/* Anything left over is a comment. */
int k;
if (strlen(next) < 8) {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Expected to find 8 binary digits after \"%s\" for the digital values.\n", p);
}
}
// TODO: test this!
if (strlen(next) > 8) {
strlcpy (comment, next+8, commentsize);
next[8] = '\0';
}
for (k = 0; k < (int)(strlen(next)); k++) {
if (next[k] == '0') {
draw[k] = 0;
}
else if (next[k] == '1') {
draw[k] = 1;
}
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Found \"%c\" when expecting 0 or 1 for digital value %d.\n", next[k], k+1);
}
}
}
n++;
}
}
if (n < T_NUM_ANALOG+1) {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Found fewer than expected number of telemetry data values.\n");
}
}
/*
* Now process the raw data with any metadata available.
*/
#if DEBUG1
text_color_set(DW_COLOR_DECODED);
dw_printf ("%d: %.3f %.3f %.3f %.3f %.3f \n",
seq, araw[0], araw[1], araw[2], araw[3], araw[4]);
dw_printf ("%d %d %d %d %d %d %d %d \"%s\"\n",
draw[0], draw[1], draw[2], draw[3], draw[4], draw[5], draw[6], draw[7], comment);
#endif
t_data_process (pm, seq, araw, ndp, draw, output, outputsize);
} /* end telemtry_data_original */
/*-------------------------------------------------------------------
*
* Name: telemetry_data_base91
*
* Purpose: Interpret telemetry data in the base 91 compressed format.
*
* Inputs: station - Name of station reporting telemetry.
* cdata - Compressed data as character string.
*
* Outputs: output - Telemetry in human readable form.
*
* Description: We are expecting from 2 to 7 pairs of base 91 digits.
* The first pair is the sequence number.
* Next we have 1 to 5 analog values.
* If digital values are present, all 5 analog values must be present.
*
*--------------------------------------------------------------------*/
/* Range of digits for Base 91 representation. */
#define B91_MIN '!'
#define B91_MAX '{'
#define isdigit91(c) ((c) >= B91_MIN && (c) <= B91_MAX)
static int two_base91_to_i (char *c)
{
int result = 0;
assert (B91_MAX - B91_MIN == 90);
if (isdigit91(c[0])) {
result = (c[0] - B91_MIN) * 91;
}
else {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\"%c\" is not a valid character for base 91 telemetry data.\n", c[0]);
return (G_UNKNOWN);
}
if (isdigit91(c[1])) {
result += (c[1] - B91_MIN);
}
else {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\"%c\" is not a valid character for base 91 telemetry data.\n", c[1]);
return (G_UNKNOWN);
}
return (result);
}
void telemetry_data_base91 (char *station, char *cdata, char *output, size_t outputsize)
{
int n;
int seq;
char *p;
float araw[T_NUM_ANALOG];
int ndp[T_NUM_ANALOG];
int draw[T_NUM_DIGITAL];
struct t_metadata_s *pm;
#if DEBUG2
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n%s\n\n", cdata);
#endif
strlcpy (output, "", outputsize);
pm = t_get_metadata(station);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
seq = 0;
for (n = 0; n < T_NUM_ANALOG; n++) {
araw[n] = G_UNKNOWN;
ndp[n] = 0;
}
for (n = 0; n < T_NUM_DIGITAL; n++) {
draw[n] = G_UNKNOWN;
}
if (strlen(cdata) < 4 || strlen(cdata) > 14 || (strlen(cdata) & 1)) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Internal error: Expected even number of 2 to 14 characters but got \"%s\"\n", cdata);
return;
}
seq = two_base91_to_i (cdata);
for (n=0, p=cdata+2; n<T_NUM_ANALOG+1 && *p!='\0'; n++,p+=2) {
if (n < T_NUM_ANALOG) {
araw[n] = two_base91_to_i (p);
}
else {
int k;
int b = two_base91_to_i (p);
for (k=0; k<T_NUM_DIGITAL; k++) {
draw[k] = b & 1;
b >>= 1;
}
}
}
/*
* Now process the raw data with any metadata available.
*/
#if DEBUG2
text_color_set(DW_COLOR_DECODED);
dw_printf ("%d: %.3f %.3f %.3f %.3f %.3f \n",
seq, araw[0], araw[1], araw[2], araw[3], araw[4]);
dw_printf ("%d %d %d %d %d %d %d %d \n",
draw[0], draw[1], draw[2], draw[3], draw[4], draw[5], draw[6], draw[7]);
#endif
t_data_process (pm, seq, araw, ndp, draw, output, outputsize);
} /* end telemtry_data_base91 */
/*-------------------------------------------------------------------
*
* Name: telemetry_name_message
*
* Purpose: Interpret message with names for analog and digital channels.
*
* Inputs: station - Name of station reporting telemetry.
* In this case it is the destination for the message,
* not the sender.
* msg - Rest of message after "PARM."
*
* Outputs: Stored for future use when data values are received.
*
* Description: The first 5 characters of the message are "PARM." and the
* rest is a variable length list of comma separated names.
*
* The original spec has different maximum lengths for different
* fields which we will ignore.
*
* TBD: What should we do if some, but not all, names are specified?
* Clear the others or keep the defaults?
*
*--------------------------------------------------------------------*/
void telemetry_name_message (char *station, char *msg)
{
int n;
char stemp[256];
char *next;
char *p;
struct t_metadata_s *pm;
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n%s\n\n", msg);
#endif
/*
* Make a copy of the input string because this will alter it.
* Remove any trailing CR LF.
*/
strlcpy (stemp, msg, sizeof(stemp));
for (p = stemp + strlen(stemp) - 1; p >= stemp && (*p == '\r' || *p == '\n') ; p--) {
*p = '\0';
}
pm = t_get_metadata(station);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
next = stemp;
n = 0;
while ((p = strsep(&next,",")) != NULL) {
if (n < T_NUM_ANALOG + T_NUM_DIGITAL) {
if (strlen(p) > 0 && strcmp(p,"-") != 0) {
strlcpy (pm->name[n], p, sizeof(pm->name[n]));
}
n++;
}
}
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("names:\n");
for (n = 0; n < T_NUM_ANALOG + T_NUM_DIGITAL; n++) {
dw_printf ("%d=\"%s\"\n", n, pm->name[n]);
}
#endif
} /* end telemetry_name_message */
/*-------------------------------------------------------------------
*
* Name: telemetry_unit_label_message
*
* Purpose: Interpret message with units/labels for analog and digital channels.
*
* Inputs: station - Name of station reporting telemetry.
* In this case it is the destination for the message,
* not the sender.
* msg - Rest of message after "UNIT."
*
* Outputs: Stored for future use when data values are received.
*
* Description: The first 5 characters of the message are "UNIT." and the
* rest is a variable length list of comma separated units/labels.
*
* The original spec has different maximum lengths for different
* fields which we will ignore.
*
*--------------------------------------------------------------------*/
void telemetry_unit_label_message (char *station, char *msg)
{
int n;
char stemp[256];
char *next;
char *p;
struct t_metadata_s *pm;
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n%s\n\n", msg);
#endif
/*
* Make a copy of the input string because this will alter it.
* Remove any trailing CR LF.
*/
strlcpy (stemp, msg, sizeof(stemp));
for (p = stemp + strlen(stemp) - 1; p >= stemp && (*p == '\r' || *p == '\n') ; p--) {
*p = '\0';
}
pm = t_get_metadata(station);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
next = stemp;
n = 0;
while ((p = strsep(&next,",")) != NULL) {
if (n < T_NUM_ANALOG + T_NUM_DIGITAL) {
if (strlen(p) > 0) {
strlcpy (pm->unit[n], p, sizeof(pm->unit[n]));
}
n++;
}
}
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("units/labels:\n");
for (n = 0; n < T_NUM_ANALOG + T_NUM_DIGITAL; n++) {
dw_printf ("%d=\"%s\"\n", n, pm->unit[n]);
}
#endif
} /* end telemetry_unit_label_message */
/*-------------------------------------------------------------------
*
* Name: telemetry_coefficents_message
*
* Purpose: Interpret message with scaling coefficents for analog channels.
*
* Inputs: station - Name of station reporting telemetry.
* In this case it is the destination for the message,
* not the sender.
* msg - Rest of message after "EQNS."
* quiet - suppress error messages.
*
* Outputs: Stored for future use when data values are received.
*
* Description: The first 5 characters of the message are "EQNS." and the
* rest is a comma separated list of 15 floating point values.
*
* The spec appears to require all 15 so we will issue an
* error if fewer found.
*
*--------------------------------------------------------------------*/
void telemetry_coefficents_message (char *station, char *msg, int quiet)
{
int n;
char stemp[256];
char *next;
char *p;
struct t_metadata_s *pm;
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n%s\n\n", msg);
#endif
/*
* Make a copy of the input string because this will alter it.
* Remove any trailing CR LF.
*/
strlcpy (stemp, msg, sizeof(stemp));
for (p = stemp + strlen(stemp) - 1; p >= stemp && (*p == '\r' || *p == '\n') ; p--) {
*p = '\0';
}
pm = t_get_metadata(station);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
next = stemp;
n = 0;
while ((p = strsep(&next,",")) != NULL) {
if (n < T_NUM_ANALOG * 3) {
// Keep default (or earlier value) for an empty field.
if (strlen(p) > 0) {
pm->coeff[n/3][n%3] = atof (p);
pm->coeff_ndp[n/3][n%3] = t_ndp (p);
}
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Equation coefficent position A%d%c is empty.\n", n/3+1, n%3+'a');
dw_printf ("Some applications might not handle this correctly.\n");
}
}
}
n++;
}
if (n != T_NUM_ANALOG * 3) {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Found %d equation coefficents when 15 were expected.\n", n);
dw_printf ("Some applications might not handle this correctly.\n");
}
}
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("coeff:\n");
for (n = 0; n < T_NUM_ANALOG; n++) {
dw_printf ("A%d a=%.*f b=%.*f c=%.*f\n", n+1,
pm->coeff_ndp[n][C_A], pm->coeff[n][C_A],
pm->coeff_ndp[n][C_B], pm->coeff[n][C_B],
pm->coeff_ndp[n][C_C], pm->coeff[n][C_C]);
}
#endif
} /* end telemetry_coefficents_message */
/*-------------------------------------------------------------------
*
* Name: telemetry_bit_sense_message
*
* Purpose: Interpret message with scaling coefficents for analog channels.
*
* Inputs: station - Name of station reporting telemetry.
* In this case it is the destination for the message,
* not the sender.
* msg - Rest of message after "BITS."
* quiet - suppress error messages.
*
* Outputs: Stored for future use when data values are received.
*
* Description: The first 5 characters of the message are "BITS."
* It should contain eight binary digits for the digital active states.
* Anything left over is the project name or title.
*
*--------------------------------------------------------------------*/
void telemetry_bit_sense_message (char *station, char *msg, int quiet)
{
int n;
struct t_metadata_s *pm;
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n%s\n\n", msg);
#endif
pm = t_get_metadata(station);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
if (strlen(msg) < 8) {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("The telemetry bit sense message should have at least 8 characters.\n");
}
}
for (n = 0; n < T_NUM_DIGITAL && n < (int)(strlen(msg)); n++) {
if (msg[n] == '1') {
pm->sense[n] = 1;
}
else if (msg[n] == '0') {
pm->sense[n] = 0;
}
else {
if ( ! quiet) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Bit position %d sense value was \"%c\" when 0 or 1 was expected.\n", n+1, msg[n]);
}
}
}
/*
* Skip comma if first character of comment field.
*
* The protocol spec is inconsistent here.
* The definition shows the Project Title immediately after a fixed width field of 8 binary digits.
* The example has a comma in there.
*
* The toolkit telem-bits.pl script does insert the comma because it seems more sensible.
* Here we accept it either way. i.e. Discard first character after data values if it is comma.
*/
if (msg[n] == ',') n++;
strlcpy (pm->project, msg+n, sizeof(pm->project));
#if DEBUG3
text_color_set(DW_COLOR_DEBUG);
dw_printf ("bit sense, project:\n");
dw_printf ("%d %d %d %d %d %d %d %d \"%s\"\n",
pm->sense[0],
pm->sense[1],
pm->sense[2],
pm->sense[3],
pm->sense[4],
pm->sense[5],
pm->sense[6],
pm->sense[7],
pm->project);
#endif
} /* end telemetry_bit_sense_message */
/*-------------------------------------------------------------------
*
* Name: t_data_process
*
* Purpose: Interpret telemetry data in the original format.
*
* Inputs: pm - Pointer to metadata.
* seq - Sequence number.
* araw - 5 analog raw values.
* ndp - Number of decimal points for each.
* draw - 8 digial raw vales.
*
* Outputs: output - Decoded telemetry in human readable format.
*
* Description: Process raw data according to any metadata available
* and put into human readable form.
*
*--------------------------------------------------------------------*/
#define VAL_STR_SIZE 64
static void fval_to_str (float x, int ndp, char str[VAL_STR_SIZE])
{
if (x == G_UNKNOWN) {
strlcpy (str, "?", VAL_STR_SIZE);
}
else {
snprintf (str, VAL_STR_SIZE, "%.*f", ndp, x);
}
}
static void ival_to_str (int x, char str[VAL_STR_SIZE])
{
if (x == G_UNKNOWN) {
strlcpy (str, "?", VAL_STR_SIZE);
}
else {
snprintf (str, VAL_STR_SIZE, "%d", x);
}
}
static void t_data_process (struct t_metadata_s *pm, int seq, float araw[T_NUM_ANALOG], int ndp[T_NUM_ANALOG], int draw[T_NUM_DIGITAL], char *output, size_t outputsize)
{
int n;
char val_str[VAL_STR_SIZE];
assert (pm != NULL);
assert (pm->magic1 == MAGIC1);
assert (pm->magic2 == MAGIC2);
strlcpy (output, "", outputsize);
if (strlen(pm->project) > 0) {
strlcpy (output, pm->project, outputsize);
strlcat (output, ": ", outputsize);
}
ival_to_str (seq, val_str);
strlcat (output, "Seq=", outputsize);
strlcat (output, val_str, outputsize);
for (n = 0; n < T_NUM_ANALOG; n++) {
// Display all or only defined values? Only defined for now.
if (araw[n] != G_UNKNOWN) {
float fval;
int fndp;
strlcat (output, ", ", outputsize);
strlcat (output, pm->name[n], outputsize);
strlcat (output, "=", outputsize);
// Scaling and suitable number of decimal places for display.
if (araw[n] == G_UNKNOWN) {
fval = G_UNKNOWN;
fndp = 0;
}
else {
int z;
fval = pm->coeff[n][C_A] * araw[n] * araw[n] +
pm->coeff[n][C_B] * araw[n] +
pm->coeff[n][C_C];
z = pm->coeff_ndp[n][C_A] == 0 ? 0 : pm->coeff_ndp[n][C_A] + ndp[n] + ndp[n];
fndp = MAX (z, MAX(pm->coeff_ndp[n][C_B] + ndp[n], pm->coeff_ndp[n][C_C]));
}
fval_to_str (fval, fndp, val_str);
strlcat (output, val_str, outputsize);
if (strlen(pm->unit[n]) > 0) {
strlcat (output, " ", outputsize);
strlcat (output, pm->unit[n], outputsize);
}
}
}
for (n = 0; n < T_NUM_DIGITAL; n++) {
// Display all or only defined values? Only defined for now.
if (draw[n] != G_UNKNOWN) {
int dval;
strlcat (output, ", ", outputsize);
strlcat (output, pm->name[T_NUM_ANALOG+n], outputsize);
strlcat (output, "=", outputsize);
// Possible inverting for bit sense.